Question

The class marks of the given frequency distribution are 19.5,26.5,33.5 and 40.5.Write the corresponding class intervals.

Answer 1

Step-by-step explanation:

Solution

Class mark is the mid point of the class interval.

Class size is the upper limit minus lower limit.

Given that class mark of a class is

6.5

and

the class size is

26.5

−

19.5

=

33.5

−

26.5

=

40.5

−

33.5

=

7

By option verification,

Opition A class mark is

16

+

23

2

=

39

2

=

19.5

False

Option B class mark is

30

+

23

2

=

53

2

=

26.5

False

Option C class mark is

30

+

37

2

=

67

2

=

33.5

and

class size is

37

−

30

=

7

True

Option D class mark is

37

+

41

2

=

78

2

=

39

False